I've been heel-hooked so many times while training, mostly tapped, rarely escaped, but never been hurt or sore from it afterwards. The guys I train with are nice and very good about gradually applying pressure with subs rather than cranking them on hard.
I used to get caught in neck cranks a lot, especially when I was white belt. Sometimes they were not well-applied, so I would be stuck in a situation where I did not feel I needed to tap but my neck was still being cranked moderately. The morning after pain on these was brutal. A poorly applied kimura can also cause morning after pain because it won't be enough pain to tap but it well still place stress on the shoulder.
In fact, I think most injuries and soreness in subs are related to subs that aren't locked in, the person feels they don't need to tap and continues to work against his opponent.
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